同位素2025，Vol.38Issue(2)：155-161,7.DOI:10.7538/tws.2024.youxian.095
非平衡态低浓铀样品富集度测量修正方法与时间校正
A Correction Method and Its Time Correction for Enrichment Measurement of Non-Equilibrium Low-Enriched Uranium
张可语 1柏磊 1赵浩程 1刘一帆 1吕浩1
作者信息
- 1. 中国原子能科学研究院,北京 102413
- 折叠
摘要
Abstract
The concentration of 235U is the key information for nuclear safeguards and nuclear material accountancy,and the enrichment of 235U is usually measured and analysed based on the principle of decay equilibrium using the 185 keV energy peak of 235U and the 1001 keV energy peak of 234mPa of the daughter of 238U.However,in the production of enriched uranium,the equilibrium between the daughter and the parent body is broken after separation by gas diffusion method or centrifugation method,and the continuous generation and decay of the daughter in the newly separated samples make the measured content inaccurate,and the direct use of the 234mPa content in the daughter of 238U leads to an error in the results obtained,which is not in line with the actual enrichment degree.In order to be able to measure uranium samples in nonequilibrium,this paper proposes a time-correction method based on the 234mPa of the 238U substrate,which is based on the relationship between the sample separation time and the decay change to obtains the enrichment degree of uranium in nonequilibrium after the time correction from the relationship between the sample separation time and the decay change.The method was used to analyze and validate a 1.8%enriched UF6 gas with a separation time of about 40 days and compared the results with those obtained by PC/FRAM software.The results reduced the deviation from the nominal enrichment value from an average of 47.5%to 4.1%,achieving a more accurate correction of the calculated enrichment based on the separation time.关键词
核保障/γ能谱测量/铀富集度/非平衡态Key words
nuclear safeguards/γ spectrum measurement/uranium enrichment/non-equilibrium分类
核科学引用本文复制引用
张可语,柏磊,赵浩程,刘一帆,吕浩..非平衡态低浓铀样品富集度测量修正方法与时间校正[J].同位素,2025,38(2):155-161,7.
